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' Mr. Bob Marty <br /> Advanced GeoEnvironmental (North) <br /> GLDM <br /> July 29, 1996 <br /> Page 2 <br />' COMMENT <br />' Although concentrations for oxidized forms of nitrogen continue to diminish, the acidic nature <br /> of the localized environment appears to have been reduced significantly since the previous <br /> sampling event. Ammonium levels remain somewhat elevated however, suggested a moderate <br />' degree of recalcitrance due to the predominant microbes' apparent preference for nitrate (oxidized <br /> nitrogen) as opposed to the reduced form (ammonium). Microbial population dynamics showed <br />' an improvement in absolute recoverable numbers of both general (heterotrophic) and selective <br /> representatives, although the proportion of biodegraders in relation to the overall population did <br /> not change substantively. <br /> In light of these findings, it is strongly recommended that additional bionutrients be provided to <br /> treatable waters in order to facilitate enhanced and continued microbial growth and associated <br /> bioremedial activity. Exhaustion of available nutrients, especially in relation to nitrate, is quickly <br /> approaching and it is thus unlikely that biological activity alone can be relied upon for substantial <br /> further contaminant reduction unless appropriate nutrient supplementation is provided. <br />' Should you have any questions concerning this information, please do not hesitate to contact me. <br /> AKK:ch <br />